ADR381(RevC) Просмотр технического описания (PDF) - Analog Devices

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производитель

ADR381
(Rev.:RevC)

Precision Low Drift 2.048 V/2.500 V SOT-23 Voltage Reference

Analog Devices 

ADR380/ADR381

TERMINOLOGY

Temperature Coefficient

The change of output voltage over the operating temperature

change and normalized by the output voltage at 25°C, expressed

in ppm/°C. The equation follows:

TCVOUT

[ppm/°C]=

VOUT (T2 ) −VOUT

VOUT (25°C)×(T2

(T1)

−T1)

×106

where:

VOUT (25°C) = VOUT at 25°C.

VOUT (T1) = VOUT at Temperature 1.

VOUT (T2) = VOUT at Temperature 2.

Line Regulation

The change in output voltage due to a specified change in input

voltage. It includes the effects of self-heating. Line regulation is

expressed in either percent per volt, parts-per-million per volt,

or microvolts per volt change in input voltage.

Load Regulation

The change in output voltage due to a specified change in load

current. It includes the effects of self-heating. Load regulation is

expressed in either microvolts per milliampere, parts-per-million

per milliampere, or ohms of dc output resistance.

Long-Term Stability

A typical shift in output voltage over 1000 hours at a controlled

temperature. Figure 24 and Figure 25 show a sample of parts

measured at different intervals in a controlled environment of

50°C for 1000 hours.

ΔVOUT = VOUT (t 0 ) − VOUT (t 1 )

ΔVO UT

[ppm] =

VOUT

(t 0 ) − VOUT

VOUT (t 0 )

(t1 )

× 10 6

where:

VOUT (t0) = VOUT at Time 0.

VOUT (t1) = VOUT after 1000 hours of operation at a controlled

temperature.

Note that 50°C was chosen because most applications run at a

higher temperature than 25°C.

Thermal Hysteresis

The change of output voltage after the device is cycled through

temperature from +25°C to −40°C to +85°C and back to +25°C.

This is a typical value from a sample of parts put through such

a cycle.

VOUT _ HYS =VOUT (25°C) −VOUT _ TC

VOUT

_

HYS [ppm]=

VOUT

(25°C) −VOUT

VOUT (25°C)

_ TC

×106

where:

VOUT (25°C) = VOUT at 25°C.

VOUT_TC = VOUT at 25°C after a temperature cycle from +25°C to

−40°C to +85°C and back to +25°C.

Rev. C | Page 10 of 16

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